Top portion of a liquid dispenser



FIG. 1 is a is a perspective view of the ornamental design of a top portion of a liquid dispenser showing our design;

FIG. 2 is a front view of the top portion of a liquid dispenser;

FIG. 3 is a side view of the top portion of a liquid dispenser; and,

FIG. 4 is a top view of the top portion of a liquid dispenser.

The broken lines shown in FIGS. 1-4 of the drawings are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a top portion of a liquid dispenser, as shown and described. 